NGC 1999 vs NGC 1333
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NGC 1999
NGC 1999 is an Orion reflection nebula lit by V380 Orionis; observations in 2009 showed its dark keyhole is an empty cavity, not dust.
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NGC 1333
NGC 1333 is a Perseus reflection nebula discovered by Eduard Schonfeld in 1855 and known as an active young star-forming region.
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